3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $foo = null; var_dump($foo ?? 'bar', $foo ?: 'bar');
Output for 7.0.0 - 7.2.0
string(3) "bar" string(3) "bar"
Output for 5.3.20 - 5.6.28
Parse error: syntax error, unexpected '?' in /in/Ym7dn on line 4
Process exited with code 255.